Power consumption reduction method for a stored battery

Abstract

A power consumption reduction method controls a rechargeable battery to enter a sleep mode after the electronic system is shutdown with the output current of the rechargeable battery falling under a first current value or the rechargeable battery is in a non-communication status for over a first delay time. When in the sleep mode, a control unit further controls the rechargeable battery to enter a power saving mode when the output voltage of the rechargeable battery falls under a predefined voltage or the RSOC of the rechargeable battery is lower than a percentage of FCC, and the output current of the rechargeable battery falls under a second current value or the rechargeable battery is in the non-communication status for over a second delay time. The method shuts down all power-consuming circuits and components under long-time idling of the battery, capable of preventing overly discharging and malfunction of the rechargeable battery.

What is claimed is: 
     
       1. A power consumption reduction method for a stored battery, wherein a rechargeable battery is installed in an electronic system and comprises a control unit, a battery set, and a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) module, the MOSFET module comprising a discharging MOSFET and a charging MOSFET, the method comprising using the control unit to perform the following steps:
 when an output current of the battery set is detected by the control unit to be under a first current value for over a first delay time, or when the battery set is detected by the control unit to be in a non-communication status for over the first delay time, the control unit controlling the rechargeable battery to enter a sleep mode; and 
 when the rechargeable battery is configured in the sleep mode, and either an output voltage of the battery set is detected by the control unit to be under a predefined voltage or a relative state of capacity (RSOC) of the battery set is detected by the control unit to be lower than a critical percentage value, and either the output current is detected by the control unit to be under a second current value for over a second delay time or the battery set is detected by the control unit to be in a non-communication status for over the second delay time, the control unit controlling the rechargeable battery to enter a power saving mode. 
 
     
     
       2. The method of  claim 1 , wherein the control unit controlling the rechargeable battery to enter the sleep mode comprises step: the control unit turning off the charging MOSFET, thereby opening a charging circuit of the rechargeable battery, while the discharging MOSFET remains turned-on and a discharging circuit of the rechargeable battery remains closed. 
     
     
       3. The method of  claim 1 , wherein the control unit controlling the rechargeable battery to enter the power saving mode comprises step: the control unit turning off the discharging MOSFET, thereby opening a discharging circuit of the rechargeable battery. 
     
     
       4. The method of  claim 3 , wherein the control unit controlling the rechargeable battery to enter the power saving mode further comprises step: the control unit shutting down itself. 
     
     
       5. The method of  claim 1 , wherein the first current value is 20 mA and the first delay time is 30 seconds. 
     
     
       6. The method of  claim 1 , wherein the second current value is 10 mA and the second delay time is 48 hours. 
     
     
       7. The method of  claim 1 , wherein the critical percentage value is 3% and the predefined voltage is 3.3V. 
     
     
       8. The method of  claim 1 , wherein a wake-up line is further comprised to be connected between the electronic system and the rechargeable battery, the method further comprising step: when the rechargeable battery is configured in the power saving mode, the electronic system activating the control unit by providing a voltage for the control unit via the wake-up line. 
     
     
       9. The method of  claim 1 , wherein the second current value is not greater than the first current value. 
     
     
       10. The method of  claim 1 , wherein when the battery set is in the non-communication status, a clock pin and a data pin of the battery set are both maintained at a low level status or at a high level status.